This paper presents an extensive experimental and theoretical analysis of anisotropy effects in superconducting niobium. It is concluded that anisotropy efFects, especially in the magnetic properties, are clearly discernible and that the theoretical analysis results in a mean-square anisotropy of the electron -phonon interaction of 0.0335 + 0.0035 and of the Fermi velocity of 0.118+ 0.007. These anisotropy parameters are in excellent agreement with previous de Haas - van Alphen experiments.

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